The book of Isaiah contains prophecies delivered by Isaiah of Amoz to Israel and Judah, with the first 39 chapters containing words of divine judgment and the destruction of surrounding nations, while the remaining 27 chapters provide comfort and hope through a promise of release from captivity and the coming of a future Redeemer and Kingdom. Isaiah uses vivid imagery and poetic language to convey messages from God about the fate of nations and an eventual time of salvation and peace.